lib/Target/PIC16/PIC16RegisterInfo.cpp

   1 //===- PIC16RegisterInfo.cpp - PIC16 Register Information -----------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file contains the PIC16 implementation of the TargetRegisterInfo class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #define DEBUG_TYPE "pic16-reg-info"
  15
  16 #include "PIC16.h"
  17 #include "PIC16RegisterInfo.h"
  18 #include "llvm/ADT/BitVector.h"
  19
  20
  21 using namespace llvm;
  22
  23 PIC16RegisterInfo::PIC16RegisterInfo(const TargetInstrInfo &tii,
  24                                      const PIC16Subtarget &st)
  25   : PIC16GenRegisterInfo(PIC16::ADJCALLSTACKDOWN, PIC16::ADJCALLSTACKUP),
  26     TII(tii),
  27     ST(st) {}
  28
  29 #include "PIC16GenRegisterInfo.inc"
  30
  31 /// PIC16 Callee Saved Registers
  32 const unsigned* PIC16RegisterInfo::
  33 getCalleeSavedRegs(const MachineFunction *MF) const {
  34   static const unsigned CalleeSavedRegs[] = { 0 };
  35   return CalleeSavedRegs;
  36 }
  37
  38 // PIC16 Callee Saved Reg Classes
  39 const TargetRegisterClass* const*
  40 PIC16RegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
  41   static const TargetRegisterClass * const CalleeSavedRegClasses[] = { 0 };
  42   return CalleeSavedRegClasses;
  43 }
  44
  45 BitVector PIC16RegisterInfo::getReservedRegs(const MachineFunction &MF) const {
  46   BitVector Reserved(getNumRegs());
  47   return Reserved;
  48 }
  49
  50 bool PIC16RegisterInfo::hasFP(const MachineFunction &MF) const {
  51   return false;
  52 }
  53
  54 void PIC16RegisterInfo::
  55 eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
  56                     RegScavenger *RS) const
  57 {    /* NOT YET IMPLEMENTED */  }
  58
  59 void PIC16RegisterInfo::emitPrologue(MachineFunction &MF) const
  60 {    /* NOT YET IMPLEMENTED */  }
  61
  62 void PIC16RegisterInfo::
  63 emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const
  64 {    /* NOT YET IMPLEMENTED */  }
  65
  66 int PIC16RegisterInfo::
  67 getDwarfRegNum(unsigned RegNum, bool isEH) const {
  68   assert(0 && "Not keeping track of debug information yet!!");
  69   return -1;
  70 }
  71
  72 unsigned PIC16RegisterInfo::getFrameRegister(MachineFunction &MF) const {
  73   assert(0 && "PIC16 Does not have any frame register");
  74   return 0;
  75 }
  76
  77 unsigned PIC16RegisterInfo::getRARegister() const {
  78   assert(0 && "PIC16 Does not have any return address register");
  79   return 0;
  80 }
  81
  82 // This function eliminates ADJCALLSTACKDOWN,
  83 // ADJCALLSTACKUP pseudo instructions
  84 void PIC16RegisterInfo::
  85 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
  86                               MachineBasicBlock::iterator I) const {
  87   // Simply discard ADJCALLSTACKDOWN,
  88   // ADJCALLSTACKUP instructions.
  89   MBB.erase(I);
  90 }
  91